re: Meteroites-still dubious
I wasn't saying directly that just because certain microbes
can tough out conditions that would instantly kill most other
life forms that this means that panspermia is for real.
What I am saying with all those examples is that life is tougher
than we once thought (and by once I mean just 30-40 years ago)
and it does raise the odds for panspermia - be it to or from Earth -
happening if not eventually here then somewhere in the Universe.
And we do know that rocks from Luna and Mars have come here.
And I would be willing to bet that there are at least some Earth
rocks on our moon.